function setze_y(id, wert){
	if (document.all){
		if (!isNull(document.all(id))) {
			document.all(id).style.posTop = wert;
		}
	}else if (document.layers){
		document.layers[id].top = wert;
	}else if (document.getElementById){
		if (typeof(document.getElementById(id)) != "undefined") {
			if (!isNull(document.getElementById(id))) {
				document.getElementById(id).style.top = wert + "px";
			}
		}
	}
}


var ID;
window.onload = init;

function init(){
	ID = setInterval("animate();", 100);
}

function animate(){
	if (document.layers){
		var y = window.pageYOffset+160;
	}else if (document.all){
		var y =document.documentElement.scrollTop+160;
	}else if (document.getElementById){
		var y = window.pageYOffset+160;
	}

	setze_y("b_skyscraper", y);
}

function isNull(what){return what==null}